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MASTER: new dwarf nova outburst

ATel #8116; E. Popova, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian (The Instituto de Astrofisica de Canarias), V. Kornilov, N. Tiurina, P. Balanutsa, A. Kuznetsov (M. V. Lomonosov MSU, SAI), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University), A. Tlatov, V. Senik, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), O. Gress, N. Budnev, K. Ivanov (Irkutsk State University, Applied Physics Institute), D. Buckley, S. Potter, M. Kotze (South African Astronomical Observatory), V. Krushinsky (Ural Federal University)
on 3 Oct 2015; 00:12 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Cataclysmic Variable, Transient, Variables

MASTER OT J045704.81+640247.6 discovery - new dwarf nova outburst with Ampl>4.7(no sources in VIZIER) and its previous outburst in 2012

MASTER-IAC auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 04h 57m 04.81s +64d 02m 47.6s on 2015-10-02.16609 UT.

The OT unfiltered magnitude is 17.3m (the limit is 19.4m).

The OT is seen in 6 images.
There is no minor planet at this place. We have more then 200 reference images without OT in MASTER databases since 2010, for ex., on 2015-08-04.19935 UT with unfiltered magnitude limit 18.8m (MASTER-IAC).
There are 4 images with the previous outburst of this OT in MASTER-Amur database on 2012-10-20 13:42:21.986 and 14:28:59.912UT with m_OT=17.2. No any sources in VIZIER database inside 5", so we suggest the dwarf nova outburst with current amplitude more then 4.7m.
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/045704.81640247.6.png

MASTER Global Robotic Net